Telephone system.



F. N. REEVES.

TELEPHONE SYSTEM.

APPLICATION mu) ran. 27, 1915.

. Patented June 13, 1916.

/n venfol Frank N. Reeves OWM/md.

UNITED STATES PATENT oEEIoE.

FRANK N. REEVES, OF NEWARK, JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS, TOWESTERN ELECTRIC COMPANY, INCORPORATED, A CORPORATION OF NEW YORK.

TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented June 13, 1916.

Application filed February 27, 1915. Serial No. 11,044.

To all whom it may concern;

Be it known that I, FRANK N. REEVES, a citizen of the United States,residing at Newark, in the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in Telephone Systems, ofwhich the following is a full, clear, concise, and exact description.

This invention relates to telephone systems, and particularly to testingcircuits for use with automatic finder switches.

The principal object of the invention resides in the provision ofcircuits of this character which will permit of a desired one of aplurality or group of lines to be selected by means of a switch movingat high speed.

In the drawings a finder switch of the panel type, together with so muchof the circuits as is necessary to an understanding of this inventionare disclosed.

The switch indicated in the drawing may be substantially the same asthat disclosed in Patent No. 1,123,696, although obviously thisinvention is applicable to any finder switch, the movement of which iscontrolled by an electromagnet which is maintained continuouslyenergized during the movement of the switch.

The sequence switches shown in the drawings may be and preferably aresimilar to that disclosed in Patent No. 1,127,808. All the sequenceswitch contacts which appear to the left of the switch shaft arecontrolled by the sequence switch adjacent thereto, and all the sequenceswitch contacts on the opposite side of the switch shaft are controlledby the sequence switch at the right.

The numerals which appear adjacent to the several sequence switchcontacts represent the positions of the sequence switch at which therespective contacts are closed, except the numerals which appearadjacent the contacts immediately above each of the sequence switcheswhich represent the positions in which these contacts are opened, andconsequently the positions in which the sequence switches may stop.

In the drawing, 1 represents the switch shaft to which is secured a set2 of brushes which, in the movement of the switch, are arranged totraverse the contacts in the bank 3. The shaft 1 is provided at thelower end thereof with a bar 4 adjacent which is a constantly rotatingfriction power drum 5. Adjacent the drum 5 but on the opposite side ofthe bar 4 is an idler pulley 6 by means of which the bar 1- may beforced into operative engagement with the drum 5 upon energization ofthe clutch magnet 7. Also secured to the shaft 1 is an interrupter brush8 adapted to traverse the conducting segments on the interrupter 9 uponmovement of the shaft. The conduct ing segments and insulating portionsof the interrupter 9 are so arranged that the brush 8 is in engagementwith a conducting segment at all times except when the brushes of set 2are centrally positioned on one of the cooperating sets of contacts inthe bank 8.

The finder switch in the embodiment of the invention herein disclosed isarranged to associate an operators sending device with a cord circuitwhen the cord circuit is connected to the line of a calling subscriber.But obviously the test circuit is equally ap plicable to any finderswitch whatever.

The operation of the invention is as follows: When the subscriber atsubstation S removes his receiver from the hook, a signal will be causedto appear in the usual manner adjacent to the jack 10 of the substationline. The operator, observing the signal, will insert the plug 11 in thejack 10, whereupon the cord relay 12 will be energized completing acircuit from battery through the selector sequence switch motor magnet13, sequence switch contact 14 (1), armature contact of relay 12, toground. The selector sequence switch thereupon moves to po sition 2. Acircuit is now completed from battery through clutch magnet controlrelay 15, sequence switch contact 16 (1), sequence switch contact 17 (2)to ground. Relay 15 is energized and completes a circuit from batterythrough cord finder sequence switch motor magnet 18, sequence switchcontact 19 (1), contact and armature of relay 15 to ground, whereuponthe cord finder sequence switch goes to position 2.

Upon the energization of the relay 15 a holding circuit is completedfrom battery through the winding of said relay, its lower armature andcontact, interrupter 9 and brush 8 to ground, thus insuring that relay15 will remain energized until the brushes of set 2 become centrallypositioned on the first set of contacts.

In position 2 of the cord finder sequence switch, a circuit is completedfrom battery through clutch magnet 1', sequence switch contact 20 andfront contact and armature of relay 15 to ground. The elevating bar a isforced against the rotating drum 5 by the idler pulley 6 and the switchis caused to move upwardly. A circuit new extends from battery throughrelay 15, sequence switch contact 16 (2), back contact and armature oftest relay 21 to ground. The circuit for the test relay 21 extends frombattery through the winding of said relay and sequence switch contact tothe test brush of the switch. The test contact of the selected cord orconnecting circuit will be grounded through sequence switch contact 2st(2). The test contact of the remaining trunks of the group will bewithout potential.

When the brushes 2 of the finder switch engage the contacts of theselected cord, the circuit for test relay 21 will be completed throughthe test contact and contact 2i (2), and said relay will pull up openingone branch of the holding circuit for the clutch magnet relay 15. Theother branch of the holding circuit for this relay, however, will bemaintained through interrupter 9 until the brushes oi' the set 2 arecentrally positioned on the contacts of the selected trunk. hen theyhave reached this position the brush 8 will pass on to an insulatingsegment of the interrupter 9, and relay 15 will fall oil interruptingthe circuit for the clutch magnet '7, thus stopping the movement of theswitch. The upper armature of relay 15 at its back contact completes acircuit from battery through the cord finder sequence switch motormagnet 18, sequence switch contact 19 to ground. The cord findersequence switch thereupon passes to position 3.

hen the cord finder sequence switch goes to position 3, sequence switchcontact 25 (3) is closed and completes a circuit from ground throughsaid sequence switch contact, brush 26 and the contact engaged thereby,sequence switch contact 27 sequence switch motor magnet 13 to batteryand ground. The selector sequence switch thereupon moves to position 3,thus opening up sequence switch contact 21 and removing the seekingpotentialtrom the test contact of the selected cord. In position 3 thesender, which is diagrammatically illustrated in the drawing, is alsoconnected to the cord through the finder brushes 28, 29, the contactsengaged thereby, and sequence switch contacts 30 and 31 By means of thesender the automatic switches used to build up the talking connectionmay be operated, and when the sender has completed its operation it willbe removed from operative relation to the cord in the usual manner.

hat is claimed is:

1. In combination, a switch, an electromagnetfor controlling themovement thereof, an interrupter actuated in the movement of saidswitch, a relay, a circuit for said magnet controlled by said relay, atest relay and a circuit for said first relay controlled alternately bysaid test relay and said interrupter.

2. In combination, a switch, an electromagnet for controlling themovement thereof, a test relay, a second relay, a circuit for saidmagnet extending through front contacts of said second relay, a circuitfor said second relay extending through contacts of said test relay,said test relay being operated to open the circuit of said second relayupon the switch engaging the contacts of the required line, and meansfor maintaining said second relay energized until the switch brushes arecentrally positioned on said contacts.

In combination, a switch, an electromagnet for controlling the movementthereof, a test relay, a second relay, a circuit for said magnetextending through front contacts of said second relay, a circuit forsaid second relay extending through back contacts of said test relay,said test relay being energized to open the circuit of said second relayupon the switch engaging the contacts of the required line, and meansfor maintaining said second relay energized until the brushes arecentrally positioned on said contacts.

#1. In combination, a switch, an electromagnet for controlling themovement 01' said switch, an interrupter actuated in the movement ofsaid switch, a relay, a circuit for said magnet extending through frontcontacts of said relay, a test relay, and a circuit for said firstmentioned relay extending through back contacts of said test relay andsaid interrupter in parallel.

In combination, a switch, a test brush carried thereby, contactsarranged to be traversed by said brush, interrupter contacts arrangedto'be closed while the test brush is passing from one contact to thenext, an electromagnet for controlling the movement of said switch, arelay, a circuit for said magnet extending through front contacts ofsaid relay, a test relay, a circuit for said first mentioned relayextending through back contacts of said test relay, means for causingthe energization of said test relay when said test brush engages thetest contact of a desired line, and a holding circuit for said firstmentioned relay completed through said interrupter while the switchbrush is in transit between contacts.

6. In combination, a switch, a test brush carried thereby, contactsarranged to be traversed by said brush, interrupter contacts arranged tobe closed While the test brush is passing from one contact to thenext,an electromagnet for controlling the movement of said switch, a relay, acircuit for said magnet extending through front contacts of said relay,a test relay, a circuit for said first mentioned relay extending throughback contacts of said test relay, means for causing the energization ofsaid test relay when said test brush engages the test contact of adesired line, and a holding circuit for said relay extending through anarmature and front contact thereof and said interrupter. 15

In witness whereof, I hereunto subscribe my name this 26th dayofFebruary, A. D.

FRANK N. REEVES. Witnesses E. EDLER, K. L. STAHL.

copies of this potent my be obtained to: five cent: each, by oddreuln:the "Commissioner ot latent, Wuhlngton, D. 0."

